Peel and very finely slice the onion and garlic, deseed and finely slice the chillies, finely chop the coriander stalks, reserving the leaves, then place in a bowl. Coarsely grate in the paneer and squash (deseed if needed), then peel and finely grate in the ginger. Sprinkle in the flour and a pinch of sea salt and black pepper, then squeeze over the lime juice. Add the curry paste and 50ml of water, then mix.
Drizzle 2 tablespoons of oil into a large non-stick frying pan over a medium-low heat, then roughly divide the mixture into 4 portions and place in the pan, flattening them out into rough rounds, about the width of the buns (don’t worry about wispy edges, it’ll mean bonus crunch later!). Fry for 16 minutes, or until golden and cooked through, turning every few minutes. Meanwhile, pound most of the coriander leaves to a paste in a pestle and mortar, muddle in the yoghurt, then season to taste. Finely shred the lettuce, halve the burger buns (warm first, if you like), and puff up the dry poppadoms in the microwave for 30 seconds each.
Divide the coriander yoghurt between the bases and inside bun-lids, then break up the poppadoms and sprinkle over. Place a crispy bhaji burger on top of each bun-base, add a dollop of mango chutney, a few coriander leaves and the lettuce, then pop the tops on and press down lightly.
Serve with a cold beer and extra fresh chilli if you love a bit of heat (like me!).